1. Schlichting,H.,1936,"Experimental Investigation of the Problemof Surface Roughness,"NACA TM-832,National Advisory Committee onAeronautics.
2. Nikuradse,J.,1933,"LawsofFlowin RoughPipes,"NACATM1292,NationalAdvisoryCommitteeonAeronautics.
3. St and cf Augmentation for Real Turbine Roughness With Elevated Freestream Turbulence